摘要
以沪通(上海—南通)铁路安亭下行疏解线新建路基下穿运营京沪高速铁路为例,采用ABAQUS软件建立了三维有限元模型,研究了桩基施工、筏板施工、路基填筑3个施工阶段对京沪高速铁路桥墩、桥面板和桩基础的影响,并结合现场沉降监测结果验证了数值模拟的可靠性。研究结果表明:各施工阶段均对运营京沪高速铁路桥梁结构和桩基础产生一定影响,筏板基坑开挖阶段对桥墩和桩基础的水平变形影响最为显著,路基填筑阶段对桥墩竖向沉降的影响更明显;京沪高速铁路桥面板坡率受新建路基施工影响程度较小,远低于规范限值;钻孔桩和筏板混凝土浇筑可有效抵消桩孔开挖和筏板基坑开挖对桥梁和桩基础的不利影响。
Taking the newly built subgrade of the Shanghai-Nantong railway Anting downstream untwining line underneath the Beijing-Shanghai high speed railway as an example,a three-dimensional finite element model was established by ABAQUS software.The influence of pile foundation construction,raft construction and subgrade filling on pier,bridge deck and pile foundation of Beijing-Shanghai high speed railway was studied.The reliability of numerical simulation was verified by field settlement monitoring results.The results show that each construction stage has a certain impact on the bridge structure and pile foundation of Beijing-Shanghai high speed railway,the raft foundation pit excavation stage has the most significant impact on the horizontal deformation of the pier and pile foundation,and the subgrade filling stage has a more obvious impact on the vertical settlement of the bridge pier.The slope ratio of bridge deck of Beijing Shanghai high speed railway is less affected by the construction of new subgrade,which is far below the standard limit.Bored piles and raft concrete pouring can effectively offset the adverse effects of pile hole excavation and raft pit excavation on the bridge and pile foundation of Beijing-Shanghai high speed railway.
作者
谢浩
XIE Hao(China Railway Siyuan Survey and Design Group Co.Ltd.,Wuhan 430063,China)
出处
《铁道建筑》
北大核心
2020年第11期102-106,共5页
Railway Engineering
基金
中铁第四勘察设计院集团有限公司科技研究开发计划(2015K23)。
关键词
铁路路基
施工影响分析
数值模拟
运营高速铁路
桩基施工
筏板施工
路基填筑
沉降监测
railway subgrade
construction influence analysis
numerical simulation
high speed railway in operation
pile foundation construction
raft construction
subgrade filling
settlement monitoring
